Astilbe plant named ‘Flamingo’

ABSTRACT

A distinct cultivar of Astilbe plant named ‘Flamingo’, characterized by its upright plant habit; rapid growth rate; dark green leaves; very freely and uniformly flowering; and attractive pink-colored flowers.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of Astilbe plant, botanically known as Astilbe hybrid, and hereinafter referred to by the cultivar name ‘Flamingo’.

The new cultivar is a product of a planned breeding program conducted by the Inventor in Noorden, The Netherlands. The objective of the breeding program was to develop new fast-growing compact Astilbe cultivars.

The new cultivar originated from a cross made by the Inventor in 1992 of the Astilbe×Arendsii cultivar ‘Bressingham Beauty’, not patented, as the male or pollen parent, with the Astilbe japonica cultivar ‘Vesuvius’, not patented, as the female or seed parent.

The cultivar ‘Flamingo’ was discovered and selected by the Inventor as a flowering plant within the progeny of the stated cross in a controlled environment in Noorden, The Netherlands.

Asexual propagation of the new cultivar by divisions harvested at Noorden, The Netherlands, has shown that the unique features of this new Astilbe are stable and reproduced true to type in successive generations.

SUMMARY OF THE INVENTION

Plants of the cultivar ‘Flamingo’ have not been observed under all possible environmental conditions. The phenotype may vary somewhat with variations in environment such as temperature, light intensity, daylength, and fertility level without, however, any variance in genotype.

The following traits have been repeatedly observed and are determined to be the unique characteristics of ‘Flamingo’. These characteristics in combination distinguish ‘Flamingo’ as a new and distinct cultivar:

1. Upright plant habit.

2. Rapid growth rate.

3. Dark green leaves.

4. Very freely and uniformly flowering.

5. Attractive pink-colored flowers.

Plantsbn of the new Astilbe differ from plants of the male parent, the cultivar ‘Bressingham Beauty’, in inflorescence shape and flower color, in addition, plants of the new Astilbe are more compact than plants of the cultivar ‘Bressingham Beauty’.

Plants of the new Astilbe differ from plants of the female parent, the cultivar ‘Vesuvius’, in leaf and flower color, in addition, plants of the new Astilbe are taller than plants of the cultivar ‘Vesuvius’.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying colored photographs illustrate the overall appearance of the new cultivar, showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description which accurately describe the actual colors of the new Astilbe.

The photograph on the first sheet comprises a side perspective view of a typical plant of the Astilbe.

The photograph at the top of the second sheet comprises a close-up view of a typical inflorescence of the new Astilbe.

The photograph at the bottom of the second sheet comprises a close-up view of a typical leaf of the new Astilbe.

DETAILED BOTANICAL DESCRIPTION

In the following description, color references are made to The Royal Horticultural Society Colour Chart except where general terms of ordinary dictionary significance are used. Plants used for the description were about one year-old and grown in 17-cm containers under outdoor production conditions which closely approximate commercial production conditions during the spring and summer in Noorden, The Netherlands.

Botanical classification: Astilbe hybrid cultivar ‘Flamingo’.

Parentage:

Female parent.—Astilbe japonica cultivar ‘Vesuvius’, not patented.

Male parent.—Astilbe×Arendsii cultivar ‘Bressingham Beauty’, not patented.

Propagation:

Type.—By root divisions.

Time to rooting.—About 3 months at temperatures about 18° C.

Root description.—Fine.

Plant description:

Crop time.—From divisions, about 40 weeks are required to produce fully-grown flowering plants in 17-cm containers.

Form.—Upright, compact; inverted triangle.

Branching habit.—Flowering stems and leaves arise from the roots.

Plant height.—About 60 cm.

Area of spread.—About 60 cm.

Vigor.—Moderate; rapid growth rate.

Stems.—Length: About 60 cm. Internode length: About 8 cm. Texture: Very sparsely covered with very short (less than 0.5 mm) light brown hairs. Color: 137C to 141B.

Foliage description.—Arrangement: Bi-ternately compound; alternate. Quantity of leaflets per leaf: Typically about 15 to 25. Leaf length, including petiole: About 32 cm. Leaf width: About 22 cm. Leaflet length: About 3.5 cm. Leaflet width: About 2 cm. Leaflet shape: Ovate to elliptic. Leaflet apex: Acuminate to acute. Leaflet base: Rounded to attenuate. Leaflet margin: Serrate, occasionally double serrate. Leaflet texture: Slightly lustrous; lower surface very sparsely covered with very short (less than 0.5 mm) light brown hairs along the midvein. Leaflet color: Young foliage, upper surface: 137A. Young foliage, lower surface: 137C. Mature foliage, upper surface: 139A. Mature foliage, lower surface: 137B to 137C. Venation, upper surface: 139A. Venation, lower surface: 138B to 139C. Petiole: Length: About 10 cm. Diameter: About 2.5 mm. Texture: Very sparsely covered with very short (less than 0.5 mm) light brown hairs. Color: 137C to 141B; base, 184A to 185A.

Flower description:

Flower type and habit.—Numerous small single flowers arranged in branched panicles. Very freely flowering with 1,000 flowers and flower buds per plant. Flowers sessile.

Natural flowering season.—Continuously flowering typically during the early summer.

Flower longevity.—Flowers last a few weeks on the plant and more than one week as a cut flower. Flowers persistent.

Fragrance.—Faint musty odor, not unpleasant.

Flower buds.—Length: About 3 mm. Diameter: About 1.8 mm. Shape: Ovate to orbicular. Rate of opening: About two to three weeks from visible bud to fully opened flower. Color: 67A to 67B.

Flower size.—Length (height): About 5 mm. Diameter: About 4.5 mm.

Petals.—Arrangement: Five. Shape: Ligulate to linear. Apex: Obtuse. Margin: Entire. Length: About 4 mm. Width: About 1.5 mm. Texture: Smooth. Color: When opening, upper and lower surfaces: 65A. Fully opened flower, upper and lower surfaces: 65C to 65D.

Calyx.—Length: About 5 mm. Width: About 6 mm. Number of sepals: About five. Sepal shape: Ovate. Sepal apex: Obtuse. Sepal margin: Entire. Sepal color, both surfaces: 61B to 63A.

Reproductive organs.—Stamens: Stamen number: About ten. Anther attachment: Basifixed. Anther length: Less than 0.5 mm. Anther color: Creamy white to light gray. Pollen amount: Scarce. Pollen color: Creamy white. Pistils: Pistil number: Two. Pistil length: About 2 mm. Stigma shape: Club-shaped. Stigma color: Close to 67A. Style length: About 1.5 mm. Style color: 67A. Ovary color: 67A.

Seed.—Length: Less than 0.5 mm. Diameter: Less than 0.5 mm. Color: Light brown.

Disease resistance: Under commercial conditions, plants of the new Astilbe have exhibited some resistance to diseases common to Astilbe. 

It is claimed:
 1. A new and distinct cultivar of Astilbe plant named ‘Flamingo’, as illustrated and described. 